Temporal Requirements of cMyc Protein for Reprogramming Mouse Fibroblasts

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Corey Heffernan1, Huseyin Sumer, Luis F Malaver-Ortega

  • 1Cell Reprogramming and Stem Cells Laboratory, Centre for Reproduction and Development, Monash Institute of Medical Research, Monash University, 27-31 Wright Street, Clayton, VIC 3168, Australia.

Stem Cells International
|May 24, 2012
PubMed

Insights

Recombinant protein delivery of Myc (pTAT-mcMyc) successfully replaced the cMyc gene in somatic cell reprogramming, maintaining efficiency and pluripotency without uncontrolled cell growth risks.

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Molecular Biology

Background:

  • Somatic cell reprogramming into induced pluripotent stem cells (iPSCs) typically requires Oct4, Sox2, Klf4, and cMyc.
  • Excluding cMyc reduces proliferation risks but significantly lowers reprogramming efficiency.
  • Alternative methods for delivering reprogramming factors are needed to optimize safety and efficacy.

Purpose of the Study:

  • To assess the feasibility of using recombinant pTAT-mcMyc protein delivery as a substitute for the cMyc transgene.
  • To determine if pTAT-mcMyc delivery can maintain reprogramming efficiency and pluripotency without compromising safety.
  • To investigate the mechanisms of Thy1 repression by cMyc and other reprogramming factors.

Main Methods:

  • Purification and delivery of recombinant pTAT-mcMyc protein to somatic cells.
  • Assessment of reprogramming efficiency via Oct4-GFP(+) colony formation.
  • Evaluation of pluripotency markers and lineage gene (Thy1) repression.
  • Comparison of protein delivery with traditional transgene-based methods.

Main Results:

  • pTAT-mcMyc protein delivery successfully maintained reprogramming efficiency and pluripotency.
  • The protein delivery method did not increase risks of uncontrolled proliferation.
  • Differential repression of Thy1 was observed, suggesting complex regulatory mechanisms.
  • Staggered delivery approaches did not enhance reprogramming efficiency.

Conclusions:

  • Recombinant protein delivery of cMyc is a viable alternative to transgenes for somatic cell reprogramming.
  • This method offers a safer approach by avoiding risks associated with cMyc transgenes.
  • Protein delivery serves as a valuable tool for dissecting the molecular events in cellular reprogramming.

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